三嵌段共聚物在气-液界面的有序组装

将氢化的苯乙烯(PS)/丁二烯(PB)/苯乙烯(PS)三嵌段共聚物(SEBS)磺化,得到磺化的SEBS(S－SEBS),在水亚相上铺展了S－SEBS的Langmuir膜,研究其π－A特性.制备S－SEBS的Langmuir－Blodgett(LB)膜,用原子力显微镜(AFM)对其表面形态进行了研究,并以芘作为荧光探针研究了溶液和膜中S－SEBS聚集态的变化.研究结果表明,S－SEBS在气－液界面可以形成由两亲性的纳米小球组装而成的有序的二维和三维的纳米结构.对纳米结构形成的机理进行了初步分析.

Ordered Assembly of Triblock Copolymer on Air-water Interface

Abstract Sulfonated hydrogenated styrene-butadiene-styrene triblock copolymer(S-SEBS) was prepared by reaction of hydrogenated styrene-butadiene-styrene triblock copolymer(SEBS) with acetic anhydride and sulphuric acid. The assembly of S-SEBS on air-water interface was studied by using Langmuir film balance. Langmuir-Blogett(LB) film of S-SEBS was prepared and investigated by atomic force microscopy (AFM) in non-contact mode. The aggregations of S-SEBS in solution and in LB films were studied by fluorescence spectroscopy by using pyrene as fluorescence probe. The experimental results show that the ordered 2D and 3D-nanostructures composed of amphiphilic nanospheres have been obtained on the air-water interface. A possible mechanism for the formation of the nanostructures is proposed.